Since <I>A Prairie Home Companion</I> first went on air July 6 1974 a steady stream of great musicians has crossed its stage—The Steele Sisters Gillian Welch and Dave Rawlings Peter Ostroushko The Wailin Jennys Robin and Linda Williams Iris DeMent Howard Levy—plus the radio detective Guy Noir the Cowboys Dusty and Lefty the librarian Ruth Harrison Duane and his Mother and the good people of Lake Wobegon Minnesota. An all-star roster of favorite performers joined to celebrate the anniversary on the lawn of Macalester College in St. Paul a stone's throw from the hall where the first broadcast was made. Some highlights from that show are presented here interwoven with archival performances by Doc Watson Odetta Pete Seeger Helen Schneyer Chet Atkins Bill Hinkley & Judy Larson Soupy Schindler and Tom Keith.